Valve-gear.



UNITED STATES PATENT OFFICE.

VALVE-=GEAH.

Specification of Letters Patent.

- Patented April 30, 1907.

Original application filed December 22, 1905, Serial No. 292.964. Divided and this application filed December 6, 1906. serial No. 346.574.

T0 at whom it may concern:v

Be it known that I, HUGO LENTZ, a subject of the German Em ire, and a resident of 123 Kurfiirstendamm, Ialensee, near Berlin, in the Empire of Germany, engineer, have invented certain new and useful Improvements in and Relating to Valve-Gears, of WhlCh the following is a specification.

This inventionrelates to means for diminishing the counter-pressure in ex losive gas engines when starting, and the o ject of the invention is to provide effective means'for obtaining an additional 0 ening of the exhaust valve during the perio of compression when starting the motor. According to this invention, said means for diminishing the coun ter-pressure consist in a movable boss arranged in the reciprocating distributer containing the exhaust valve, which boss rocks with the distributer, being ressed toward the interior of the distributer y a spring and caused to project by the displacement of an axial wedge or an equivalent part, in order to act upon the exhaust member.

In the accompanying drawing: Figure 1 is a veiw showing the means for operating the exhaust valve. Fig. 2 shows a detail, and Fig. 3 is a diagram of the distribution.

It is known that explosion engines usually operate with exceedingly high degrees of comression and for this reason various means ave been heretofore-provided in these engines which on starting permit of opening the exhaust during the com ression period, for the urpose of reducing t e counter-pressure to a out atmos heric pressure, thereby rendering it possib le to start with a small absorption of power. The present invention comprises a means of this kind applicable to valve distributions with reciprocating distributer. This means consists of a movable boss sliding in the rocking distributing cam or plate and pressed back' in such a manner that it is ei'laced or lodged within the distributing member during normal running; in starting, this boss, being lifted by appropriate means, projects in such a manner as to open the exhaust valve during a portion of the compression period, thereby preventing the establishment of a high counter-pressure in the cylinder. r v

In Fig. 1, a designates the exhaust cam of an engine operated With a cycle of four phases, in which the distributing shaft rotates at one half the speed of the'driving shaft; this cam is provided with a fixed boss b, for the regular opening of the exhaust valve, and in a recess an auxiliary boss 0 pressed inward by a spring By Way of exam le of the operationof this boss, Figs. 1 and 2 indicate a movable key e sliding in a bore in the rocking shaft of the distributer. The displacement of the key toward the right hand (Fig. 2) serves to lift the auxiliary boss 0 and to open the exhaust member f. 1

In the diagram forming part of Fig. 1, the

are 3-4 represents the normal aperture'of crank in describing the angle gh, so that instarting any increase of pressure during the compression period, capable of increasingthe resistances, may be obviated in a simple and effective manner.

The key or wedge which in this particular arrangement serves to effect the displacement of the auxiliary boss, may be replaced by any other part capable of fulfilling 'the same notions. Thus, in place of a key or wedge, wheel transmission gear may be employed, for example, by giving to the auxiliary boss the form of a rack in engagement with a wheel arranged in the recessed shaft of the distributer.

The mechanism described by way of example, for the displacement of the auxiliary boss permits of groupin the whole of the parts in a very restricted space and also of dlspensingwith certain parts.

Having now particularly described and ascertained the nature of my invention and in What manner it may be performed, I declare thatwhat I claim is:

1. In an explosion motor, means for diminishing the counter-pressure in starting, which consist in a movable boss arranged-in the reciprocating distributer controlling the exhaust valve, which boss rocks with the distributor and being pressed toward the interior of the distributer by a spring'and caused to project by the displacement of anaxial wedge or-an equivalent part, in order to act upon the exhaust member substantially as described. i

2. In an explosion motor, means for di-' minishing the counter-pressure in starting, which consist in a movable rocking boss arranged in the reciprocating distributer, said boss being connected with a part serving to displace it, for example a rod capable of axial displacement in such a manner that when this part is acted upon this movable boss is either caused .to project or to recede substan tially as described.

during the compression period, and means for operatingthe pin. p

In testimony whereof I have hereunto placed my hand, at Berlin, Germany, this 15th day of Novbr 1906.

.HUGO LENTZ.

in the presence of two witnesses- VVO DEMAR HAUPT, HENRY HASPER. 

